Fabric softening composition

A solid fabric softening composition comprising:

• (a) from 35 to 60% by weight of a disintegrant system;
• and
• (b) from 5 to 65% by weight of a quaternary ammonium compound having a structure represented by formula (I)
• (R1)(R2)—N+—[(CH2)n—Z—R3][(CH2)m—Y—R4]A− (I)
• wherein each of R1 and R2 is independently a C1-C4 alkyl group or a C2 to C4 alkenyl group;
• each R3 and R4 is independently a C7 to C27 alkyl group or alkenyl group;
• each of Z and Y is independently —O—(O)C— or —C(O)—O—;
• m and n are each independently a number from 1 to 4;
• A− is an anionic counterion selected from methyl sulfate, ethyl sulfate, methanesulfonate, ethanesulfonate, sulfate, phosphate, nitrate, formate, carbonate, benzoate, tosylate, acetate, lactate, citrate, chloride, bromide, fluoride, iodide, and mixtures thereof;
• wherein the disintegrant system comprises a combination of salt and acid;
• wherein the salt comprises carbonate salts;
• wherein the weight ratio of the carbonate salt to the acid is from 1:10 to 10:1;
• and
• wherein the composition is in the form of a tablet.